Funny story regarding photos of cards presented as proof of certification. I tried to use a PDF of scanned photos of my original PADI DM card from 2009. One side of the card has the PADI logo and says "Divemaster" while the OTHER side of the card shows my photo, name, cert number, and date. The dive operator looked at the PDF with those two images combined on the one PDF and said, "How do I know those two photos are from the same card?" Because the side with my photo, name, etc, did not always say PADI and Divemaster, he would not accept it. He assumed that it could easily be fraudulent and that those two photos were not in fact from the same card.
So be careful with photos of cards. I'm not sure if this applies to current PADI cards or not, but it is clearly an issue with older cards.
My SDI/TDI digital cards downloaded from their website or app all have everything on one image ... photo, name, certification, certification number, instructor, dive center, and agency. I pretty much use those exclusively and have never had an issue with those being accepted. In my above example, once I showed him one of my TDI cards (Advanced Nitrox), he was happy.